Method and apparatus for making paper bags



Nov. 6, 1934. .H. A. WOLF METHOD AND APPARATUS FOR MAKING PAPER BAGS Filed May 18 1952 WIT/MESS.

ArM A/ KS areas. Nov. 6, 1934 UNITED STATES PATENT OFFICE DIETIHOD AND APPARATUS FOR MAKING PAPER BAGS Philadelphia, Pa.

Application May 18, 1932, Serial No. 611,960

11 Claims. 7 (or. lie-19) 1 This invention relates to an improvement in method and apparatus for making paper bags, and more particularly to the making of paper bags of the fiat or envelope type and having a long lip or closure flap.

Heretofore the production of paper bags or envelopes having a long lip or closure flap has entailed complicated procedure and the use of machinery presenting complication in its struc-- ture and operation and at the same time expensive to produce and maintain.

Thus, for example, paper bags or envelopes of the type contemplated have been produced by the formation of a paper tube, slitting'opposite sides of the tube longitudinally at intervals" For the carrying out of the indicated methods.

heretofore used, it has been necessary to provide a complicated system of knives and cutters to efiectuate the longitudinal slitting, whether in the web or tube, and the transverse cutting. The necessary knives and cutters are costly to produce and maintain and d'rmcult to adjust.

Now in accordance with this invention, paper bags or envelopes having a long square cornered lip or closure flap may be emciently produced by asimple and economicprocedure and with apparatus which may be readily and inexpensively adopted to the usual machines for producing short flap bags or envelopes.

In the practical adaptation of this invention a web of paper is formed into a; tube by the use of any usual forming mechanism-and the tubefed over the end of the former in proximity to a fixed out ofi blade, in coperation with both of which a striker havingtransverse and longitudinal members periodically acts to sever bag lengths from the tube. i

More specifically the edge of the fixed cut on blade is positioned above and. behind the end oithe former.

end'of the former to transversely sever one wall of the tube and with the cut off blade to sever the other wall of the tube. The striker is also provided with longitudinal members which cotially simultaneously in a simple, eilective and The striker is provided with a transverse member which cooperates with the operate with the edges of the former adjacent to its end to sever the edges of the tube longitudinally between the ends of the lines of transverse severance.

In practical operation the striker is driven at relatively high speed so that the transverse severance of one wall of the tube and the longitudinal slitting of the edges is effected substantially simultaneously and is followed immediately by transverse severance of the other wall with the result that the bag lengths are severed from the tube and the long lip or closure flap is. formed in a single operation and substaneconomic manner without the addition of any new moving parts to the usual bag machine.

Having now indicated in a general way the nature and purpose of this invention, I willproceed to a detailed description of a preferred 5 embodiment thereof with reference to the'accompanying drawing in which:

Figure 1 is a plan view, partly in section, of an apparatus embodying this invention and adapted for the carrying out of the method of this invention.

Figure 2 is a'perspective view of a bag or envelope produced in accordance with this invention.

Figure 3 is a plan view of the striker included 35 in the apparatus of Figure 1.

Figure 4 is a sectional view showing a detail of construction of the striker in cooperation with the end of the former and with the cut. ofi blade.

Figures 5 and 6 are sectional views showing details of the striker.

Referring to Figure 2 in which a bag or 'envelope having a long lip or closure flap is shown, it will be noted that the body of the bag A 'is 95 closed atits bottom by means of a flap b andv that closure of the top or open end is provided by a flap bf., The flaps b and b, it will ,be noted, are similar 'and .are square cornered and oi desired length. The flaps b and b are produced in the severance of lengths from a paper tube,

the walls of the'tube being severed on spaced transverse lines and the opposite edges of the tubebeing severed on longitudinal lines joining the ends of the transverse lines of severance.

- Referring now to Figures 1 and 13-6, ,0 indicates a former such as is commonly used in envelope bagmachines for forming a tube at from a web of paper e. -The former may be oi 1,10

.is driven by any suitable mechanism any usual construction, as, for example, such as is illustrated and described in the Poppe patent above referred to, and is provided at its rear with a serrated edge I.

The web of paper is drawn about the former and the tube formed and advanced by means .of rolls, g, g, -mounted on a suitably driven' shaft h, supported from a table '2', and cooperating with the table to advance the tube beyond the end I of the former.

Positioned above the former and to the rear of the edge 1 thereof is a out 01f blade 7' supported from a bracket 10, the edge of which'is serrated and spaced from edge 1 of the former a distance equal to the desired length of the flaps b, b of the bag.

A striker Z is mounted on a disc m and extends at an angle to the periphery of the disc so that on revolution of the disc the striker will travel in a conical path as shown in Figure 1. The disc m is mounted on a shaft n, which (not shown) so that the striker is caused to periodically cooperate with the edge of the former and the edge of the cut off blade, as indicated by dotted lines, Figure 2.

The striker Z comprises a transverse severing member 0 and spaced longitudinally extending severing members 12, p.

The members p, p are similar and comprise blades q, mounted on supports r secured to and extending from the member 0. The supports 1' are slidably mounted in a groove in member 0 and secured by meansof machine screws ex-,

tending through slots in member 0 as shown in Figure 4. The slots enable adjustment of members p, go toward and away from each other for different size bags. The surfaces of the supports r are cut on an angle so that the blades will lie thereon at an angle in their transverse extension as shown in Figure 6. The blades are provided with transversely extending slots s and are secured to supports r by means of clamps t securedto the supports by screws u which pass through the slots 8 and permit the blades to be transversely adjusted, all as will be clear from inspection of Figures 5 and 6.

As will now be appreciated, in the operation of the apparatus embodying my invention as above described, for the carrying out of the method embodying my invention, the web of paper e is formed into the tube at about the former 0, being advanced as is the tube when formed bythe rolls a. The tube d is advanced beyond the end of the former and is severed into lengths by the action of the striker which is operated in timed relation to the advance of the tube so as to strike off or sever desired lengths.

In the operation of the striker, it will be noted that the member 0 cooperates with the end of the former and with the cut off blade to sever the sides ofthe tube d respectively,

while the members p, p cooperate with opposite edges z, a: of the former adjacent its end to sever the edges of the tube longitudinally between the lines of severance of the sides. The action of the members 11, pof the striker may be readily perceived from inspection of'Figures 4 and 6.

Thus, having the operation of the striker in cooperation with the end and edges of the former and with the cut off blade, desirably long square cornered flaps, as b, b are formed and on lines extending longitudinally of the edges thereof between said transversely extending lines.

2. The method of producing a paper bag which includes continuously forming a tube from a web of paper and advancing the tube as formed, and while the tube is advancing severing lengths from the tube in its advance by a substantially simultaneous severance of its walls' transversely on longitudinally spaced lines and of its edges longitudinally between the ends of the lines of transverse severance.

3. The method of producing a paper bag which includes forming a tube from a web of paper,advancing the tube relative to a pair of spaced severing edges extending transversely of the walls of the tube respectively-and striking the tube adjacent to said edges while it is advancing to effect a severance of the walls of the tube transversely on longitudinally spaced lines and to effect a severance of the edges of the tube longitudinally between the ends of the lines of severance of thewalls thereof.

4. The method of producing a paper bag which includes'forming a tube from a web of paper, advancing the tube relative to a pair of spaced severing edges extending transversely of the walls of the tube respectively, striking the tube adjacent the side edges while the tube is advancing to effect a transverse severance of one wall'of the tube on the line of one of said severing edges, then effecting a longitudinal severance of the edges of the tube between the lines of said severing edges and finally trans versely severing the other wall of the tube on the line of said other severing edge. 7

5. Apparatus for the formation of paper bags including means for forming a tube from a web of paper, means for advancing the tube longitudinally as formed, a pair of severing edges positioned in the path of the tube as advanced and spaced from one another longitudinally with respect to the tube and a striker adapted to periodically co-operate with one of said severing edges to sever one wall of the tube transversely and to sever the edges of the tube longitudinally and to co-operate with the other of said severing edges to sever the other wall of said tube transversely.

6. Apparatus for the formation'of paper bags including means for forming a. tube from a web.

7. Apparatus for the formation of paper bags including means for forming a tube from a web of paper, means for advancing the tube longitudinally as formed, a pair of severing edges positioned inthe path of the tube as advanced and spaced from one another longitudinally with respect to the tube and a striker having a transverse severing member and spaced longitudinal severing members lying in planes at angles to the horizontal in their transverse extension adapted to co-operate with said severing edges to efiect transverse severance of the walls of the tube and longitudinal severance of the edges thereof between the 'lines of transverse severance.

8. Apparatus for the formation of paper bags including means for forming a tube from a web of paper, means for advancing the tube longitudinally as formed, severing edges positioned in the path. of the tube as advanced, said severing edges comprisirg a pair of edges spaced from one another longitudinally with respectto the including means for forming a tube from a web of paper, means for advancing the tube longitudinally as formed, a severing edge positioned in the path of the tube as advanced and comprising a portion extending transversely of the tube and portions extending longitudinally thereof, a second severing edge positioned in the" path of the tube as advanced and extending transversely of the tube, said first mentioned severing edge being positioned within the tube U and having its transverse portion spaced longitudinally ahead, in the direction of advance of the tube, of the second severing edge, said second severing edge being without the tube and a striker comprising a transverse member and a pair oi spaced longitudinal members, said striker being adapted to periodically cooperate with said severing edges to efiect severance of the walls of the tube on spaced transverse and longitudinal lines.

10. Apparatus for the formation of paper bags including means for forming a tube from a web of paper, means for advancing the tube longitudinally as formed, a pair of severing edges positioned in the path of the tube as advanced and spaced fromone another longitudinally with respect to the tube and a striker comprising a transversely extending member, a pair of blades and means for adjustably securing said blades to said'transverse member in spaced relation withrespect to each other and angularly with respect nal lines.

11. Apparatus for the formation of paper bags including means for forming a tube from a web of paper, means for advancing the tube longitudinally as formed, a pair of severing edges positioned in the path of the tube as advanced and spaced from one another longitudinally with respect to the tube and a striker comprising a transversely extending member,la pair of blades and means for adjustably securing said blades to said transverse member, said blades extending longitudinally with respect to said transversemember and lying in a plane at an angle to the horizontal, said striker being adapted to periodically cooperate with said severing edges to eifect severance of the walls of the tube along spaced transverse and longitudinal lines.

' HOWARD A. WOLF.- 

